It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 255 742 is not a prime number.
For example, 255 742 can be divided by 2: 255 742 / 2 = 127 871.
For 255 742 to be a prime number, it would have been required that 255 742 has only two divisors, i.e., itself and 1.
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255 742 is an even number, because it is evenly divisible by 2: 255 742 / 2 = 127 871.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 255 742 is about 505.709.
Thus, the square root of 255 742 is not an integer, and therefore 255 742 is not a square number.
The square of a number (here 255 742) is the result of the product of this number (255 742) by itself (i.e., 255 742 × 255 742); the square of 255 742 is sometimes called "raising 255 742 to the power 2", or "255 742 squared".
The square of 255 742 is 65 403 970 564 because 255 742 × 255 742 = 255 7422 = 65 403 970 564.
As a consequence, 255 742 is the square root of 65 403 970 564.
The multiples of 255 742 are all integers evenly divisible by 255 742, that is all numbers such that the remainder of the division by 255 742 is zero. There are infinitely many multiples of 255 742. The smallest multiples of 255 742 are: